A Tip on changing 3 phase AC motor rotation

td456

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  K6 R1 f! J( z/ E* `- g; ?We all know that if you want to change the rotation of a three  phase AC motor.
Just swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
9 ]( P6 ]1 ]$ VIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

* t  E+ l- |0 A9 a3 bAs the principal of the VFD works, bascially from AC to DC, then DC to AC.

! ^6 @' w8 z2 B5 x. X- U6 rThe phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.

, |2 H9 Q0 ~# z( T! G$ UThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.

jiodiangong

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